Grillage connection for towers



March 23 1926. 1,577,436

- D. T. ALEXANDER GRILLAGE CONNECTION FOR TOWERS Filed Oct. 14 1925 ll'i ieasss'ess 7 4 2 4 K (na /vase,

iii

Patented Mar. 2.3, 1926.

DAVID TASKER ALEXANDER, or SANDW CH, ONTARIO, CANADA.

.GRILLAGE CONNECTION FOB TOWERS.

Application filed October 14, 1925. Serial No. 62,393. v

To all whom it may concern:

Be it known that I, DAVID TASKER ALEX- ANDER, a subject of the United Kingdom of Great Britain, and resident of Sandwich, in the Province of Ontario, Canada, have invented certain new and useful Improvements in Grillage Connections for Towers, of which the following is a specification.

This invention relates to grillages or footings for the legs of transmission towers or the like, and more particularly to a novel means for attaching and supporting said legs in position on said grillage.

One object is to provide an attaching and supporting means to which the angle-shaped legs of a transmission tower or the like may be secured without bending or otherwise distorting their shape, thus providing a strong rigid connection.

Heretofore the legs or stub angles of transmission towers have been flattened out at their lower ends to make a fiat plate portion, which portion wasinserted between two parallel beams and riveted in position. It has been found in practice that this construction developed a weakness at the flattened portion and. that the strength of the legs was thus greatly reduced.

In the drawings:

Figure 1 is an elevation showing the lower end of a transmission tower embodying my invention.

Figure 2 is a side elevation of one of the grillages.

Figure 3 is a plan of one of the grillages.

Figure L is a detail plan showing a modified form of stub angle support.

Referring more particularly to the draw ings the letter A designates the tower structure as a whole, the lower portion only of which is shown. The tower A is of an ordinary and well known construction and consists of leg portions 2 of angle sections, which legs are secured to the stub anglesor legs 3 mounted in the grillage or footing B.

The legs 2 are connected to form a rigid structure by the cross bracing composed of laterals i and diagonals 5, in the usual manner.

This invention is directed to the footing or grillage B for the tower legs and it will, therefore, be understood that I do not wish to be limited to any particular tower construction.

The footings or grillages to which the stub angles or legs 3 are secured are mountflanges a,

ed in suitable holes in the ground and the holes may be filled with concrete or earth, as desired. The grillage consists of a plurality of Z-shaped beams 7 arranged parallel with each other in spaced relation and a pair of channel beams 8 eXtending at right angles to the longitudinal axis of the beams a. The beams 8 are secured to the top faces of the beams 7 by bolts or rivets 8 and are spaced apart to permit the mounting of the stub angles or legs 3 between said beams.

In order to secure the stub angles or legs 3 to the beams 8 I provide a novel form of M-shaped support C, which is composed of two bent plates 9 and 10. The plates 9 and 10 are bent upon themselves to form substantially V-shaped members which cooperate to form the Vt-shaped support. The

of the plates are riveted or otherwise secured to the webs of the channel beams 8, and the other flanges 12 extend away from the beams 8 and rearwardly on an angle so as to form a V-shaped pocket 12 to receive the lower ends of the stub angles or legs 3.

The stub angles are adapted to be riveted or bolted to the plates 12 as at 14: so as to form a strong and secure joint between the stub legs and grillage which will not be ifveakened at the point of juncture as heretoore.

While I have shown the M-shaped, sup port C, composed of two plates 9 and 10, it will be understood that I do not wish to be limited to this specific construction, since said support may be formed from one plate as shown in Figure 4,, if desired.

I claim:

1. The combination with a grillage for transmission towers and the like including a pair of parallel spaced beams to which the stub angles or legs of the structure are attached, of an M-shaped support for said stub angles or legs, said support having its side flanges securedto said beams, and the center V-shaped portion forming a receiving pocket for receiving both flanges of the angle stub or leg of the structure and means for securing both flanges of said angle stub or leg to the side walls of said pocket.

2. The combination with a grillage for transmission towers and the like including a pair of parallel spaced beams to which the stub angles or legs of the structure are attached, of an M-shaped support for said stub angles or legs, said support being formed from a pair of bent plates, each of said plates being bent upon themselves to form a pair of flanges one of which will extend parallel with the side walls of said beams and the other of which will extend away from said beams and rear mrdly on an angle, said flanges which extend parallel with the side walls of said beams being riveted thereto and said angularly disposed flanges forming a receiving pocket for receiving both flanges of the stub angle or leg of the structure, and means for rigidly securing both flanges of said angle stub or leg to said angularly disposed flanges.

The combination with a grillage for supporting the stub angle or leg of a trans mission tower or the like, including a pair of parallel horizontally spaced beams, of

means for attaching said stub angle or leg; to said beams, said means comynasing an Fi i-shaped support composed of a pair of bent plates, each of said plates being bent upon themselves to form a pair of flanges one of which will extend parallel with the side walls of said beams and the other of which will extend away from said beams and rearwardly on an angle, said flanges which extend parallel with the side walls of said beams being secured thereto and said angularly disposed flanges COOI'JQl'atiHg to form a \.-'-shaped receiving pocket to reccive the stub angle or leg: of the tower .v and said stub angle or leg being secured to said angularly disposed flanges by rivets passing through said flanges and the flanges of said stub angle or leg.

In testimony whereof, I have hereunto signed my name.

DAVID T. ALEXANDER. 

